Veneer drier



F. KERsHAw VENEER DRIER Filed Nov. e.

Agg. 2 1927.

VENEER DRIER lFiled Nov, e, 1925 V 2 sheets-sheetz lfg' f.

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l*Lilairso fer-aras" FREDERICK KERSI-IAW, OF PHILADELPHIA, `PENNSFSZIV'ANIA, ASSIGNOR TO PROCTOR &

SCHWARTZ, INCORPORATED, 0F PHILADELPHIA, PENNSYLVANIA, A CORPORA- TION 0F PENNSYLVANIA.

VENEER narnia.

Application filed November 6, 1925. Serial No. 67,410.

One object ot my invention is to construct a machine i'or drying veneers, and like materials, in such a manner that the veneers are conveyed through the drying'- chamber in close proximity to heating coils.

A further object ot the invention is to so design the drier that air will be circulated in the drying chambertransversely to the movement of the conveyors, the air returning in channels above and below said chamber.

.In the accompanying drawings: y

Fig. 1 is a plan yview ot a veneer drier illustrating my invention;

Fig. Q is a side view of the drier;

Fig. 3 is a transverse. sectional view on the line 3--3, Fig. 2; f

Fig. 4 is a diagrammatic view on the line 4 4, Fig. 3; and

Fig. 5 is a diagrammatic view showing the relation of the heating pipes to the carrying run of a conveyor in which the material is not held by the return run of an adj oiningv conveyor.

In the casing 3 of the drier is a longitudinal drying chamber 2, separated from circulating chambers 3 at each side by vertical partitions 4, in which are openings 5 for the circulating fans 6 mounted on shafts .7, and driven in the manner shown in outline in Figs. l and 2. It will be understood that the method ot driving the ians may be modiiied without departing from the main features of the invention. i

The conveyors 8 for the veneers are of the usual form, the upper run ot one conveyor being in close proximity to the lower run of the conveyor directly above it, as shown in Fig. 2. The veneer is carried between the two runs of the conveyor from one end of the drier to the other. The conveyors are driven in the present .instance by gearing at one end ot the drier.

rlhe drying` chamber 2 is separated from the return circulating passage 9 93L by an upper partition 10 and a lower partition ll. These circulating passages communicate at each end with the circulating chamber 3 at each side of the drier. The fans 6 circulate the air transversely through the drying chamber, the air returning through theA opposite side circulating chamber and the upper and lower circulating passages as clearly indicated by the arrows in Fig. 3.V

In order to heat the air and the veneers being conveyed, a vseries ot steam coils l2 are arranged yhorizontally between the advancing and return runs of each conveyor. These coils are connected to vertical manifold pipes 13 locatedin the sidecirculating chamber opposite the one occupied by a tan. By this construction, the veneers are conveyed in close proximity to the heating means, while warm air is circulated in the spaces between the pipes and the runs of the conveyors carrying the veneers. The drier in the present instance is divided by transverse partitions v14 into compartments 15, the air in each compartment j being circulated by a tan. Doors 16 are located at each side of the drier, which may be open to any degree desired to admit air.

Exhaust pipes 17 are located at different f points to carry olil the moist air from certain compartments. vIn the pipes are exhaust fans of the usual construction.

VMy invention may be used in any form` of drier in which the air circulates trans-v versely of the travel of the conveyor. While my invention is primarily a veneer drier, it will be understood that it can be used for drying any boards heavier than veneers Aor boards of any type, and while I prefer to arrange the conveyors so that the lower run ot one conveyor will hold the material being dried upon the upper run of another conveyor, in some types of heavy boards the arrangement ot the conveyors may be such that the material is simply carried by the upper run, as shown inFig. 5.

In referring to Figs. 4 and 5, it will be seen that the heating pipes are of an equal distance from the carrying runs of the conveyors, although in some instances the pipes may be located directly under the carrying run.

I claim:

The combination in a drier, of a casing; two vertically arranged longitudinal partitions therein separating a central drying chamber from side circulating chambers;

two horizontal partitions separating the drying chamber from upper and lower circulating passages; fans in one of the vertical partitions; means for driving the fans so that air willpass transversely through the drying chamber, returning through the side circulating chambers and the upper and lower Circulating chambers; aseree of endless conveyors extending longitudinally in the drying chamber; andsteam heating pipes 10 loca-ted in the drying chamber between the upper and lower runs of certain conveyors.

FREDERICK VKERSHAW. 

